Chemistry of polynuclear metal complexes with bridging carbene or carbyne ligands. Part 98. Tri- and tetra-nuclear metal compounds with ethylidyne or p-tolylmethylidyne groups, and having both cyclopentadienyl and carbaborane ligands
- 1 January 1990
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 7,p. 2239-2245
- https://doi.org/10.1039/dt9900002239
Abstract
The trimetal compounds [MWAu(µ-CR)(µ-CR′)(CO)4(η-C5H5)(η5-C2B9H9Me2)](M = Mo or W, R = R′= C6H4Me-4; M = W, R = R′= Me; R = Me, R′= C6H4Me-4) have been prepared by treating the complexes [MAuCl(µ-CR′)(CO)2(η-C5H5)](M = Mo or W, R′= C6H4Me-4; M = W, R′= Me) with the reagents [NEt4][W(CR)(CO)2(η5-C2B9H9Me2)](R = C6H4Me-4 or Me) in CH2Cl2 in the presence of TIBF4. The trimetal compounds react with [Pt(cod)2](cod = cyclo-octa-1,5-diene) or [Pt(PMe2Ph)2(nb)](nb = norbornene = bicyclo [2.2.1]heptene) to afford, respectively, the complexes [W2PtAu(µ-CC6H4Me-4)(µ3-CC6H4Me-4)(CO)4(cod)(η-C5H5)(η5-C2B9H9Me2)] and [MWPtAu(µ-CR′)(µ3-CR)(CO)4(PMe2Ph)2(η-C5H5)(η5-C2B9H9Me2)](M = W, R = R′= C6H4Me-4; R = Me, R′= C6H4Me-4; M = Mo, R = R′= C6H4Me-4). The cod complex was prepared by an alternative method, by treating [NEt4][WPt(µ-CC6H4Me-4)(CO)2(cod)(η5-C2B9H9Me2)] with [WAuCl(µ-CC6H4Me-4)(CO)2(η-C5H5)], in the presence of TIBF4. Addition of an excess of PMe2Ph in thf (tetrahydrofuran) to [W2PtAu(µ-CC6H4Me-4)(µ3-CC6H4Me-4)(CO)4(cod)(η-C5H5)(η5-C2B9H9Me2)] in the same solvent results in displacement of both cod and W(CC6H4Me-4)(CO)2(η-C5H6) groups, and formation of the trimetal complex [WPtAu(µ3-CC6H4Me- 4)(CO)2(PMe2Ph)3(η5-C2B9H9Me2)]. The i.r. and n.m.r. (1H and 13C-{1H}) data for the compounds are reported and discussed.Keywords
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